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authorSven Gothel <sgothel@jausoft.com>2020-01-27 02:40:19 +0100
committerSven Gothel <sgothel@jausoft.com>2021-04-20 06:49:29 +0200
commit39e56516063cf63b0599bb7a35fe6ec69556e994 (patch)
tree41bb89bac89da9077cc2ca95dfb3b9ab7681f6fe /win/C#/frmGenPreview.Designer.cs
parent0446de00adb980cf14bbe9886e494f09e72592ac (diff)
nvenc-encoder2: Merging my CQ (VBR) settings of old 'nvenc-encoder' branch w/ new master branchhw-encoder-nvenc
First of all, big KUDOS to the Handbreak team to pull-in and maintain the libav -> ffmpeg transition as well as the nvenc-encoder work load. This new nvenc-encoder branch uses my settings for CQ (VBR) on NVENC, while giving some references to the documentation. I like the new init_qp* settings, good job. What might be helpful here is to have 'bf' paramter for B frames to be set, as well as NVENC specific parameters like AQ and LOOKAHEAD? Here I use the recommended best values and 'bf=2', a compromise between low animation and sports. Since LOOKAHEAD does a dynamic b-frame adaptation, this should be OK - if not great. Below my comment section about my settings: // NVEnc Performance see Chapter 4 of Video_Codec_SDK_8.0.14/doc/NVENC_Application_Note.pdf // sgothel@jausoft.com usually uses the nvenc-h264 setting: // - constant quality (cq) of 26-24, which enforces variable bitrate (vbr), // - constant framerate (cfr) w/ framerate=source // - preset=hq (high quality), profile=high, level=auto // // Resulting to av_opts: // 'preset=hq,rc=vbr_hq,cq=26.00,init_qpP=26.00,init_qpB=28.00,init_qpI=24.00,bf=2,rc-lookahead=16,spatial-aq=1,forced-idr=1,profile=high' // // NVEnc: // - GeForce GTX 950, has Compute SM 5.2 // - AQ enabled // - Lookahead enabled: depth 16, scenecut enabled, B-adapt enabled. // // This achieves w/ HD 1080p source and even frame cropping in Handbreak around 160fps, // matching the net expected of around 270fps less consumption via decoding and cropping.
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